A kind of high-voltage nickel-cobalt lithium manganese oxide positive electrode material and preparation method thereof

A technology of nickel-cobalt-lithium-manganese-manganate and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of fast cycle attenuation, particle pulverization, poor stability, etc., achieve convenient operation, promote sintering, increase crystal The effect of face spacing

Active Publication Date: 2022-01-28
HEFEI RONGJIE ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-voltage nickel-cobalt lithium manganese oxide positive electrode material and its preparation method to solve the problems of poor stability, fast cycle attenuation and particle pulverization of the nickel-cobalt lithium manganese oxide positive electrode material in the prior art under high voltage. question

Method used

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  • A kind of high-voltage nickel-cobalt lithium manganese oxide positive electrode material and preparation method thereof
  • A kind of high-voltage nickel-cobalt lithium manganese oxide positive electrode material and preparation method thereof
  • A kind of high-voltage nickel-cobalt lithium manganese oxide positive electrode material and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a high-voltage nickel-cobalt lithium manganese oxide positive electrode material comprises the following steps.

[0032] Step (1): Weigh Ni by molar ratio 1:0.0004:0.0025:0.53 0.5 co 0.2 mn 0.3 (OH) 2 , La 2 o 3 , LiF and Li 2 CO 3 Place in a ball mill, and ball mill for 3 hours at a speed of 300r / min to obtain the mixed material A;

[0033] Step (2): Put the mixed material A obtained in step (1) in a muffle furnace to raise the temperature to 940°C at a heating rate of 5°C / min, calcinate in an air atmosphere for 10h, then cool naturally to room temperature, grind, crush and sieve , the nickel-cobalt-lithium-manganese-oxide dopant is prepared, and the chemical formula of the nickel-cobalt-lithium-manganate dopant is LiNi 0.5 co 0.1992 mn 0.3 La 0.0008 o 1.995 f 0.0025 ;

[0034] Step (3): Mix aluminum phosphate, diammonium hydrogen phosphate aqueous solution, and nickel-cobalt lithium manganate dopant in a mass ratio of 1:0.003:0.015...

Embodiment 2

[0054] A method for preparing a high-voltage nickel-cobalt lithium manganese oxide positive electrode material comprises the following steps.

[0055] Step (1): Weigh Ni by molar ratio 1:0.001:0.0025:0.55 0.5 co 0.2 mn 0.3 (OH) 2 , La 2 o 3 , LiF and Li 2 CO 3 Place in a ball mill, and ball mill for 3 hours at a speed of 300r / min to obtain the mixed material A;

[0056] Step (2): Put the mixed material A obtained in step (1) in a muffle furnace to raise the temperature to 940°C at a heating rate of 5°C / min, calcinate in an air atmosphere for 12h, then cool naturally to room temperature, grind, crush and sieve , to prepare nickel-cobalt-lithium-manganese-oxide dopant; the chemical formula of the nickel-cobalt-lithium-manganate dopant is LiNi 0.5 co 0.198 mn 0.3 La 0.002 o 1.995 f 0.0025 ;

[0057] Step (3): Mix aluminum phosphate, diammonium hydrogen phosphate aqueous solution, and nickel-cobalt lithium manganese oxide dopant in a mass ratio of 1:0.001:0.006 and t...

Embodiment 3

[0061] A method for preparing a high-voltage nickel-cobalt lithium manganese oxide positive electrode material comprises the following steps.

[0062] Step (1): Weigh Ni by molar ratio 1:0.001:0.0025:1.12 0.5 co 0.2 mn 0.3 CO 3 , La 2 o 3 , LiF, LiOH·H 2 O is placed in a ball mill, and ball milled for 3 hours at a speed of 300r / min to obtain a mixture A;

[0063] Step (2): The mixed material A obtained in step (1) is placed in a muffle furnace to raise the temperature to 980°C at a heating rate of 5°C / min, calcined in an air atmosphere for 15h, and then naturally cooled to room temperature, ground and crushed. Sieve to prepare nickel-cobalt lithium manganate dopant material; gained nickel-cobalt lithium manganate dopant chemical formula is LiNi 0.5 co 0.198 mn 0.3 La 0.002 o 1.995 f 0.0025 ;

[0064] Step (3): Mix aluminum phosphate, diammonium hydrogen phosphate aqueous solution, and nickel-cobalt lithium manganese oxide dopant in a mass ratio of 1:0.001:0.006 an...

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Abstract

The invention discloses a high-voltage nickel-cobalt lithium manganate positive electrode material and a preparation method thereof. The nickel-cobalt lithium manganate positive electrode material refers to a nickel-cobalt lithium manganate dopant material coated with phosphate. The nickel-cobalt lithium manganate Lithium manganate dopant refers to nickel-cobalt lithium manganate doped with lanthanum and fluorine elements, and the phosphate is made by blending aluminum phosphate and diammonium hydrogen phosphate solution. The present invention can increase the interplanar spacing by doping lanthanum and fluorine elements to promote the migration of lithium ions and improve structural stability, and the surface of the material has better lithium ion conductivity and certain electronic conductivity characteristics by coating the surface with phosphate. It has higher delithiation state stability under high voltage. Moreover, the amount of residual lithium on the surface of the material is reduced, surface side reactions are suppressed, and the structural stability and cycle performance of the material under high voltage are significantly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-voltage nickel-cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery, as a green secondary storage energy, has the advantages of portability, mobility, high energy, and environmental protection. The demand for lithium batteries in electric vehicles has increased, and higher requirements have been placed on the comprehensive performance of batteries such as energy density, cycle times, and safety performance. [0003] In lithium-ion batteries, the cathode material is one of the most critical components, and its performance determines the performance of lithium-ion batteries to a large extent. At present, as the market has higher and higher requirements for high energy density battery systems, the specific capacity of cathode materials has become one of the main limiting factors res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCY02E60/10
Inventor 徐从胜王广进胡刚刚倪国华朱二涛戴首吴金林
Owner HEFEI RONGJIE ENERGY MATERIALS CO LTD
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